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IB/umad: Use stack variable 'devnum' in ib_umad_init_port 

This change is not useful by itself, but sets us up for a future
change that allows us to dynamically allocate device numbers in case
we have more than IB_UMAD_MAX_PORTS in the system.

Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Alexander Chiang 2010-02-02 19:08:35 +00:00 committed by Roland Dreier
parent 6aa2a86ec4
commit d451b8df9f
1 changed files with 9 additions and 6 deletions
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15
drivers/infiniband/core/user_mad.c
View File

@ -974,13 +974,16 @@ static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
static int ib_umad_init_port(struct ib_device *device, int port_num,
struct ib_umad_port *port)
{
int devnum;
spin_lock(&port_lock);
port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
if (port->dev_num >= IB_UMAD_MAX_PORTS) {
devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
if (devnum >= IB_UMAD_MAX_PORTS) {
spin_unlock(&port_lock);
return -1;
}
set_bit(port->dev_num, dev_map);
port->dev_num = devnum;
set_bit(devnum, dev_map);
spin_unlock(&port_lock);
port->ib_dev = device;
@ -992,7 +995,7 @@ static int ib_umad_init_port(struct ib_device *device, int port_num,
cdev_init(&port->cdev, &umad_fops);
port->cdev.owner = THIS_MODULE;
kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
if (cdev_add(&port->cdev, base_dev + port->dev_num, 1))
if (cdev_add(&port->cdev, base_dev + devnum, 1))
goto err_cdev;
port->dev = device_create(umad_class, device->dma_device,
@ -1009,7 +1012,7 @@ static int ib_umad_init_port(struct ib_device *device, int port_num,
cdev_init(&port->sm_cdev, &umad_sm_fops);
port->sm_cdev.owner = THIS_MODULE;
kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
if (cdev_add(&port->sm_cdev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1))
if (cdev_add(&port->sm_cdev, base_dev + devnum + IB_UMAD_MAX_PORTS, 1))
goto err_sm_cdev;
port->sm_dev = device_create(umad_class, device->dma_device,
@ -1036,7 +1039,7 @@ err_dev:
err_cdev:
cdev_del(&port->cdev);
clear_bit(port->dev_num, dev_map);
clear_bit(devnum, dev_map);
return -1;
}